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There should be an option or setting in Server configuration document "Router/SMTP" tab-"Restrictions and Control" tab" >> where customer can set the value for the Maximum message size of outbound messages (including through SMTP and NRPC)
Is this one good enough? For details see : https://help.hcltechsw.com/domino/12.0.0/admin/conf_restrictingmailroutingbasedonmessagesize_t.html